NTP: ntpdc: Failed to Get System Info from NTP Daemon

Enhanced PTP User Guide (UG1602)

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1.1 English

This error is normally observed when attempting to start sfptpd in one of the supported PTP and NTP/NTP fallback modes:

warning: ntpdc: failed to get system info from NTP daemon, Connection timed out
error: timed-out retrieving NTP system info. Is ntpdate running?
critical: failed to create ntp module, Connection timed out

The error occurs because on startup, sfptpd will attempt to communicate with ntpdc on the local loopback interface.

  1. Check that a loopback interface config file exists in /etc/sysconfig/network-scripts/ifcfg-lo. The file would normally contain the following lines:
    # If you're having problems with gated making a martian,
    # you can change this to something else (, for example)
  2. Check that the following line is enabled in the /etc/ntp.conf file:
    # Permit all access over the loopback interface.  This could
    # be tightened as well, but to do so would effect some of
    # the administrative functions.

    This could also be a different form:

    interface listen
  3. On some OSs it might be necessary to explicitly enable NTP mode 7 to allow communication with ntpdc/ntpd. This is done by adding the following line anywhere in the /etc/ntp.conf file:
    enable mode7
    Note: There is no space between mode and 7.